Drying apparatus for rotary kilns



July 3, 1928. 1,675,717 F. LUTHER I DRYING APPARATUS FOR ROTARY KILNS Filed May 26, 1927 I is Patented July 3, 192 8.

driers'andmore particularly to means i fi r rapidlyy'-'evaporating water from ma- 4 teifi al sjto'be treated in the kiln or drier, such for ilistaneeias' slurry, 'orthe like used in .4 man ia t l irs c e 'curyed' bafiiesl'abthe inlet partkof the rotary the-timeirequired' for-the] driving off of the V watenl is naterially reducedand therefore .it

1 "l ngtifo'f the drum. This reduction in time as well as inithe length of the drum causes a saving iii-the cost 'of the apparatus and results in an increase in efiiciency. "In the accompanying drawingsi'there is illustrated'oiie embodiment of my invention. In these drawings: Fig. 1 is a central longitudinal section of the inlet end portion of arotary drum; and Fig. 2 is a transversesection on the line 22 of Fig. 1.

In the construction illustratedithe inlet endportion of the .rotary drum a is provided with a series of longitudinally extending bafiles b which are preferably curved. Each bafile has one end secured to the peripheral wall ot'the drum in any suitable manner,

while the other. end extends to the interiorof the drum. y

The bafiles are preferably of such material that their'inner edges may vibrate or' bend due to the weight or action of 'thematerial 1 which is elevated bythe bafiles during therotation of. the drum. The ba-fil'es arev so 40' curved that during the rotation of the drum inthe direction indicated by the arrow in Fig. 2, thezmaterial ,is lifted by the several baflles in succession and drops off the free edge on to the next succeeding balller; This;

-. impact-"of the material causes the vibration name ArrARArUs roa Rowan? relates rotary kilns or y invention, I provide is possible to materially' reduce the total "PATENQ -o;E-.F DESSAU, GERMANY, essrcinoairoe; roidzsms, nnss'au, V GERMANY, A FIRM or annu ty a ipllcatien filed ma 26, 1927'; seria l "iti 1e4,5.1o.-. y

or oscillation of theibaliles and the agitation of the material.-, It also causes aircurrents between thebafiies which aid in bringing the air or lieatirigifgrrses. mto' the nost. intimate contact with; the materi al to e'ifect the rapid 5o drying thereof.

By'properlregi lation the major portion of the water.is.;e1in1inatedj,froin' the material.-

by the time it reaches end of the bafiies in its travel lengthwise-pfthe drum. The

. elimination of water isaided alsoby the fact that- 'a-fter the .materialf'idrops o'fithe edge of each 'bnffie, fl tlie..surf ace of the baffle remains wet'fandfthisJiioiSture is removed while the bafilft is inQthe upper portion of the drum;

' Having-thusidescribed myiilventiomwhat I' claiinas new-and desire to secure by :Let- Iers Patent is: i

1. A rotary drum .for'the heat treatment of material,'having at the inlet portion thereofcomparatively' Wide'. longitudinally curved 'bafile plates extending lengthwise of the drum, one edge of eachbafile being secured to the peripheral wall and -the other edges being free, the said baffles being flexible whereby as material falls from the longitudinal free edge thereof, the said edge ma oscillate-and; scatterthe falling matenal.

2. A rotary drum for the heat treatment of material, having: at the vinlet portion thereof comparatively wide curved baflie plates extendingllengthwise of the drum and projecting to a considerable distance into the drum. one edge of each bafile being secured at the peripheral wall. the-baffle being flexible'whereby the opposite longitudinal edge may swing. free and the material in "fallingfrom said-free'edge maycause said as edge to' oscillate and the material to be scattered.

Signed at Lei zig, Saxony, Germany, this twelfth day or ay, 1927-. j

' FRITZ LUTHER. 

